If $p(x) = x^2 - 4x + 3$,evaluate: $p(2) - p(-1) + p\left(\frac{1}{2}\right)$

  • A
    $\frac{31}{4}$
  • B
    $\frac{-30}{5}$
  • C
    $\frac{-32}{4}$
  • D
    $\frac{-31}{4}$

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